Override max num BLE connections to allow up to 5 connections

Author: giulcioffi

variants/ARDUINO_NANO33BLE/conf/mbed_app.json

@@ -13,6 +13,7 @@
  "platform.default-serial-baud-rate": 115200,
  "platform.callback-nontrivial": true,
  "rtos.main-thread-stack-size": 32768,
+ "cordio.max-connections": 5,
  "target.mbed_app_start": "0x10000"
  }
  }

variants/PORTENTA_H7_M4/conf/mbed_app.json

@@ -7,6 +7,7 @@
  "platform.default-serial-baud-rate": 115200,
  "platform.callback-nontrivial": true,
  "rtos.main-thread-stack-size": 32768,
+ "cordio.max-connections": 5,
  "target.macros_add": [
  "MBED_HEAP_STATS_ENABLED=1",
  "MBED_STACK_STATS_ENABLED=1",

variants/PORTENTA_H7_M7/conf/mbed_app.json

@@ -7,6 +7,7 @@
  "platform.default-serial-baud-rate": 115200,
  "platform.callback-nontrivial": true,
  "rtos.main-thread-stack-size": 32768,
+ "cordio.max-connections": 5,
  "target.mbed_app_start": "0x8040000",
  "target.macros_add": [
  "MBED_HEAP_STATS_ENABLED=1",